1939 Model A Radiator Muffler Replacement how-to. This video shows the installation of the radiator, muffler, air stack, and re-assembly of the tractor. As a note–I should have filled the radiator after I re-attached the hoses on the cooling system. I had a leak in one of the hoses, and having the hood off would have made it much easier to adjust. Know that I am not a professional, and you may do things differently or in a different order. I only provided this video for people like myself, as this video would have made it easier for me back when I knew nothing about how to get the hood off and work on the tractor. Click “read more” for more information.